Offset-web mechanism.



l. TORNBERG.

OFFSET WEB MECHANISM.

APPLICATION FILED MAR. 9, 1911.

Patented Nov. 26, 1918.

a /Quit 35 ulated in the same manner as the other v UNITED STATES PATENTOFFICE.

ISIDOR TORNZBERG, OF NEW YORK, N. Y., ASSIGNOR TO B. HOE AND CO., OF NEWYORK, N. Y., A CORPORATION OF NEW YORK.

Specification of Letters Patent.

OFFSET-WEB MECHANISM.

' Patented Nov. 26, 1918.

Application filedMarch 9, 1917. Serial No. 153,545.

To all whom it may concern:

Be it lmown that I, IsmoR TORNBERG, a citizen of the United States,residing at New York city, county of Kings, and State of New York, haveinvented certain new and useful Improvements in Offset-Web Mechanism,fully described and represented in the following specification and theaccomtween the freshly printed side of the web and the second impressioncylinder of each set of printing and perfecting cylinders, to preventoffset of ink upon the blanket of the impression cylinder, which ofi'setwould cause a smut or smudge upon the-following Web. In order to obtainprinting of very fine quality, such as letter press, it is desirable toprovide an ofiset web for each of the sets, to insure no ink beingdeposited on the impression cylinders.

The use of two separate oifset rolls, however, has the disadvantage ofimposing more care by the press operator, as these ofi'set rolls have tobe braked when the press is stopped or slowed down or otherwisemanipoperating parts of the press. Furthermore, there is valuable timeconsumed in attending to the charging of the two rolls so that afterbeing wound up they will unwind in reverse position to present a freshside to the web. In many classes of printing, however, where the qualitydoes not have to be as fine as letter press work, for instance, there isno necessity for the use of an offset roll for each of the secondcouples, one such roll preventing offset for bothof the couplessufliciently for the purposes required. In many instances, it happensthat a printer will desire to pr1nt both hlgh quality work, requiringtwo offset rolls, and

a somewhat lower grade of work, requiring but one offset roll. If,however, the machines as heretofore vconstructed are built for but oneoflset roll, they cannot, without considerable change in the mechanism,be made so that two ofiset rolls may be used.

The invention has for its especial object the provision of anarrangement whereby in a printing machine employing two sets of printingmechanism, each set'including printing and perfecting couples, eithertwo offset web rolls may be employed, one for each of the second couplesof each set, or one oli'set web roll may be employed for the secondcouples of both sets, without requiring any changes in the mechanism bywhich the result is effected, or any changing or shifting of themechanism, and without the addition of any parts.

For a complete understanding of the invention, reference may be made tothe ac companying drawing, in which Figure 1 is a diagrammatic sideelevation of a two-roll printing machine, that is, a printing machinehaving two sets of printing mechanisms, each including a printing andperfecting couple, showing the improved arrangement where two offsetrolls are employed, one for each web;

Fig. 2 is a diagrammatic side elevation of the second or upper printingcouples shown in Fig. 1, illustrating the improved arrangement where oneoffset web roll is employed for the second printing couples of each set;

Fig. 3 is a view similar toFig. 2, showing the run of one offset webafter it'has been once used and rewound ready for ananother pasagethrough the machine.

Referring now to the drawings, the invention has been illustrated inconnection with a rotary web printing machine of the class known in theart as a two-roll machine, in which there are two sets of printing andperfectin couples 1, 2, 3, 4, each couple including orm cylinders 5 andimpression cylinders 6, each of the sets of couples being suppliedfromweb rolls 7, 8. The form rolls 5 are inked in any usual manner byinking mechanism 9.

Machines constructed in accordance with the invention will have thesets, of couples spaced apart and in the space between the sets, so asto be between the web paths, will be located a pair of offset web rollsup ports. These supports may be of any suitable character, as frames10, 11 arranged back to back and provided with lipped grooves 12 forreceiving the spindles 13 of the offset rolls. The supporting frames 10,11 may be of any suitable character, and as shown are made part of theside framework 14 of the machine. The supports are duplicated on theother side of the machine, being part of the side frame thereof, thespace between the side frames at this point being left open and free forthe offset web to pass therebetween for a purpose hereinafter referredto. Located adjacent the supporting frames at opposite ends is a pair ofofi'set roll spindle supports which may be in the form of rolls 15 forreceiving the empty spindles 13 on which the offset web is rewound afterit has been passed through the machine.

In machines constructed. in accordance with the invention, guiding meanswill be provided whereby a separate offset web may be led between thesecond printing couples of each set, as the couples 2, 4, and back toseparate rewinding spindles, or one offset web may be led through bothof the second printing couples of each set and back to one spindle.These means may be of any desired character. In the particularconstruction illustrated, referring first to Fig. 1, there is shown twooffset rolls, one for each of the second printing couples. These rollsare marked 16, 16" and are supported in the grooves of the frames 10,11. The offset web, as, for instance, .web 16, is led over guide rolls17 between the paper web and the impression cylinder 60f the print ingcouple 2, so that it will be between the impression cylinder and thefreshly printed side of the web, the offset web being then rewound onone of the spindles 13. The other offset web 16 is similarly led oversuit able guide rolls 18 between the other paper iweb and the impressioncylinder 6, of the printing couple 4: and back to the other rewindingspindle 13. If, now, it be desired to produce a somewhat lower grade ofprinting, necessitating but one offset web roll, a. single ofiset webmay be led between the second couples of each set. suitable guides beingprovided for this. Such a construction is illustrated in Figs. '2 and 3.Referring to these figures, an offset web roll, as 16, is supported inthe frame 11 and. led over the guide rolls 17 between the paper web andimpression cylinder of the couple 2, then over a guide roll 19 locatedin the side frames above the web roll supports and down under the frames11 and 10 and about midway thereof to and over the guide rolls 18, bywhich it is guided between the other paper web and the impressioncylinder of the second printing couple a and back to a rewinding spindle13 located adjacent the fran'ie 10. After the offset web is passedthrough the machine and has been rewound on spindle 13, it istransferred to the supporting grooves 12 of the frame 10 and run throughthe machine in the reverse direction to that shown in Fig. '2, asillustrated in Fig. 3, it being rewound on a spindle :21 locatedadjacent the frame 11.

It .will be seen from the construction described that an improvedarrangement has been produced by which either one or two offset rollsmay be used in a machine without necessitating any mechanical changes oradjustments and a very simple and effective construction produced. Itwill also be understood that changes and variations may be made in thespecific construction of the various parts and that the invention is'not to be limited to the precise details shown.

What is claimed is:

1. In a printing machine, the combination with a. plurality of sets ofprinting and perfecting couples, each set including form and impressioncylinders of a source of web supply for each set, a pair of oflset webroll supports and means whereby a pair of offset webs may be led fromthe supports through the second couple of each set or one offset web maybe led from one of the same supports through the second couple of bothsets.

2. In a printing machine, the combination with a plurality of sets ofprinting and perfecting couples, each set including form and impressioncylinders, of a source of web supply for each set, a pair of offset webroll supports located between the web rolls, and means whereby a pair ofoffset webs may be led from the supports through the second couple ofeach set, or one offset lweb may be led from one of the same supportsthrough the second couple of both sets.

In a printing machine, the combination with a plurality of sets ofprinting and perfecting couples, each set including form and impressioncylinders, of a source of web supply for each set, a pair of offset webroll supports located between the web paths, supports for offset webroll spindles adjacent the supports, and guides whereby a pair of offsetwebs may be led from the supports through the second couple of each setto each of the spindle supports or one ofi'set web may be led from oneof the same supports through the second couple of both sets to one ofthe spindle supports.

4. In a. printing machine, the combination .with a plurality of sets ofprinting and perfecting couples, each set including form and impressioncylinders, of a source of web supply for each set, a pair of frames forsupporting ofi'set Web rolls located beleading one ofiset Web from oneof the same tween the Web paths, rolls for the ofiset Web supportsthrough the second -eouple of one roll spindles adjacent the supports onopposet to and through the second couple of the 13 site sides thereof,guides for leading a pair other set and back to one of the rollspindles.

5 of oflset Webs from the roll supports In testimony whereof, I havehereunto through the second couple of each set to set my hand.

each of the spindle supports, and guides for ISIDOR TORNBERU.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

